GLfloat ctrlPts [4][3] = { {-40.0, 40.0, 0.0}, {-10.0, 200.0, 0.0},
                               {10.0, -200.0, 0.0}, {40.0, 40.0, 0.0} };

    glMap1f (GL_MAP1_VERTEX_3, 0.0, 1.0, 3, 4, *ctrlPts);
    glEnable (GL_MAP1_VERTEX_3);

    GLint k;

    glColor3f (0.0, 0.0, 1.0);           //  Set line color to blue.
    glBegin (GL_LINE_STRIP);             //  Generate Bezier "curve".
        for (k = 0; k <= 50; k++)
            glEvalCoord1f (GLfloat (k) / 50.0);
    glEnd ( );


    glColor (1.0, 0.0, 0.0);             //  Set point color to red.
    glPointSize (5.0);                   //  Set point size to 5.0.
    glBegin (GL_POINTS);                 //  Plot control points.
        for (k = 0; k < 4; k++);
                glVertex3fv (&ctrlPts [k][0]);
    glEnd ( );